docs/structure.md

@@ -23,11 +23,13 @@ This document will explain what these mean and what you can find where.
 
 ## Root level
 
-config, links to makefile etc
+The root directory is where [the config file](config.md), [Makefile](make.md), license, drone config, 
+application entry point (`main.go`) and so on are located.
 
 ## docker
 
-TBD.
+This directory holds additonal files needed to build and run the docker container, mainly service configuration to properly run Vikunja inside a docker 
+container.
 
 ## pkg
 
@@ -57,7 +59,7 @@ TBD.
 
 TBD.
 
-Lot more explanation here.
+Needs a lot more explanation here.
 
 ### red
 
@@ -77,12 +79,20 @@ TBD.
 
 ## REST-Tests
 
-TBD.
+Holds all kinds of test files to directly test the api from inside of [jetbrains ide's](https://www.jetbrains.com/help/idea/http-client-in-product-code-editor.html).
+
+These files are currently more an experiment, maybe we will drop them in the future to use something we could integrate in the testing process with drone.
+Therefore, this has no claim to be complete yet even working, you're free to change whatever is needed to get it working for you.
 
 ## templates
 
-TBD.
+Holds the email templates used to send plain text and html emails for new user registration and password changes.
 
 ## vendor
 
-TBD.
+All libraries needed to build Vikunja. 
+
+We keep all libraries used for Vikunja around in the `vendor/` folder to still be able to build the project even if
+some maintainers take their libraries down like [it happened in the past](https://github.com/jteeuwen/go-bindata/issues/5).
+
+When adding a new  dependency, make sure to run `go mod vendor` to put it inside this directory.